Water steam effect during high CO₂ chemisorption in lithium cuprate (Li₂CuO₂) at moderate temperatures: experimental and theoretical evidence

Abstract

Li2CuO2 is able to chemisorb high quantities of CO2 in the presence of water steam at low temperatures.

CO2 chemisorption in Li2CuO2 microstructurally modified by ball milling: study performed with different physicochemical CO2 capture conditions

“…The N 2 adsorption-desorption results showed type-II isotherms according to the IUPAC classication, 38 without any kind of hysteresis loop. 19 For comparison purposes, Fig. These results provide evidence of densication, which should be attributed to both the carbonation and moderate pressure effects.…”

“…In a previous paper, 19 it was already shown that Li 2 CuO 2 is able to trap CO 2 chemically at low temperatures in the presence of water vapor, where H 2 O works as a supercial catalytic intermediate, decreasing the activation energy of the CO 2 chemisorption process. Therefore, the ball-milled Li 2 CuO 2 , possessing a larger surface area, is expected to present an interesting CO 2 capture process in the Li 2 CuO 2 -CO 2 -H 2 O system at low temperatures (30 to 80 C).…”

“…Some of the most studied materials are amines, hydrotalcites, zeolites, metal salts, carbonbased materials, metal-organic frameworks (MOFs) and metal oxides, among others. [19][20][21][22][23][24] Alkaline ceramics usually present low surface areas, which limits the CO 2 chemisorption process. [1][2][3][4][5] Among the metal oxides, alkaline ceramics are one of the most studied materials for CO 2 capture.…”

CO2—H2O Capture and Cyclability on Sodium Cobaltate at Low Temperatures (30–80 °C): Experimental and Theoretical Analysis

“…According to those studies, sodium cobaltate and metal‐containing phases are not able to chemisorb CO 2 at low temperatures ( T < 150 °C) in dry conditions. As previously mentioned, water vapor improves CO 2 capture on different alkaline ceramics at low temperatures . Therefore, addition of water vapor may enhance CO 2 chemisorption capacity on NaCoO 2 at such a low‐temperature range.…”

“…In these materials, CO 2 capture at the low‐temperature range and in dry conditions is usually poor, achieving improvements only when the particle surface area is highly increased or when their chemical surface is modified . Nevertheless, it has been reported that these ceramics are able to trap more CO 2 at low temperatures in the presence of water vapor . The alkaline ceramics that have been studied under these conditions are Li 2 ZrO 3 , Na 2 ZrO 3 , Li 5 AlO 4 , CaO, Li 4 SiO 4 , Na 2 SiO 3, and more recently Li 8 SiO 6 and Li 2 CuO 2 .…”